Using more *::Constants::ICON_* where it makes sense and
wrapping the file names into QLatin1String where they were
missing.

The increased usage of the ICON constants needed a few more
cross plugin includes of *constants.h, here and there.
I think that it is OK, since the dependencies were alredy there
icon resource wise.

There is now a nice preview for images and the
properties and borders of a BorderImage can
be visually edited

BugReport: QTCREATORBUG-1959

Proper absolute positioning is now possible

The scope is always needed

Image.PreserveAspectCrop not PreserveAspectCrop
The scope is needed

To many signals were emitted which lead to unneccary
rewriting.

Eat events to avoid moving the (parent) pane

if there is no place for the property pane we hide it

Qt change f5c5e20ab20f016c0735 optimizes the calculation of the
children's bounding rect by taking the parent bounding rect into
account. This led to a recursion in the QuickDesigner Form Editor,
because LayerItem::boundingRect() is defined as the children's bounding
rect.

Break the cycle by setting ItemClipsChildrenToShape to false.

Introducing context pane for selecting easing curves in animations.
Reviewed by: Thomas Hartmann

For some reason, my style returns a null QIcon, so the list is empty.

activating panes for Image and Rectangle

adding panes for Image and Rectangle